Leaked Windows Defender 0-Day Vulnerability Actively Exploited in Attacks

An active in-the-wild exploitation of three recently leaked Windows Defender privilege escalation vulnerabilities, with threat actors deploying proof-of-concept exploit code sourced directly from public GitHub repositories against real enterprise targets. On April 2, 2026, a security researcher operating under the alias Nightmare-Eclipse (also known as Chaotic Eclipse) published the BlueHammer exploit on GitHub following a […]

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